Friedrich frankenberg



(No Model.)

P. PRANKENBBRG. ROLLER SKATE.

No. 503,233. Patented Aug. 15,1893.

Mm as: as

UNITED STATES PATENT OFFICE.

FRIEDRICH FRANKENBERG, OF BERLIN, GERMANY.

ROLLER- SKATE.

SPEOIFIOATION forming part of Letters Patent No. 503,233, dated August15, 1893.

Application filed April 30, 1892. Renewed May 24. 1893. Serial No.475,384- I (No model.) Patented in Germany February 10.1892,No. 66,893,and in England March 26, 1892,1510. 5,965.

To all whom it may concern.-

Be it known that LFRIEDRIOH FRANKEN- BERG, a subject of the King ofPrussia, German Emperor, and a resident of Berlin, in the KingdomofPrussia, German Empire, have invented certain new and usefulImprovements in Roller-Skates, (for which I have obtained Letters Patentin England, No. 5,965, dated March 26, 1892, and in Germany, No. 66,893,dated February 10, 1892,) of which the following is a full and exactspecification.

My invention relates to a roller-skate having four wheels placed in alongitudinal plane, in contradistinction to the'usual construction ofroller-skates, where two wheels are placed beside each other.

My invention also consists in providing a lubricating device of suchconstruction, that the lubricating material is kept within the frame ofthe skate, thus avoiding any possibility of occasioning spots on theclothing by contact with the drops of outflowing oil or otherlubricating material.

My invention will be more readily understood by reference to theaccompanying sheet of drawings, on which- Figure 1 is a side-elevationof my improved roller-skate. Fig. 2'is an under side view of the same,and Fig. 3 is a partial sectional elevation, showing one of the wheelswith the bearing of its axle and box for lubricating the same.

Similar letters denote similar parts throughout the difierent views.

My improved roller-skate consists first of two parts A A forming theframe, in which the bearings for the wheels are provided. The parts Aare secured one to another by means of screw-bolts B and correspondingnuts C. At three places the parts A are bent outwardly, as will be seenat a in Fig. 2, whereby a space is provided in which the wheels D mayrotate and said parts A have the portions a which lie against each otheras shown. These wheels have their edges rounded as shown onFig. 2, andare also bored at several places E in order to reduce their weight. Theaxles F of these wheels are supers. be easily taken to pieces in orderto clean or ported in bearings G provided in the parts A, but the endsof the axles F do not protrude exteriorly, but are inolosed within thebox II. This box is filled with wad or any other material capable ofsoaking oil, 850., and provided (in its upper part) with a small hole I,preferably of conical shape, said hole being made for the application ofoil or any other lubricating material. The wheels D may be all of equaldiameter, but the two inner wheels, which are placed rather close toeach other, have their bearings provided in a lower plane than the twoouter wheels. inner wheels touch the ground, the outer wheels are not incontact with the same.

' To the partsA of the frame I secure in usual manner uprights J and tothese I secure the plates K and L respectively, for supporting the footof the skater, a screw M being provided at the rear end of the skate inorder to move the clamp grasping the heel. This part of the device ishowever not different from the usual construction of skates and I do notclaim the same as my invention.

The novel features of my roller skate are: First, the arrangement of thewheels D in the longitudinal axis of the skate, the inner wheels beingplaced close to each other and their axles in a plane below that inwhich the axles of two outer wheels are placed. By this construction andby making the edge of the wheels rounded, the turning of curves isgreatly facilitated. Secondly, the arrangement of the ends of the axlesF within a closed box H; I thereby' prevent completely any escape of thelubricating material from the skate, which escape is very annoying inthe usual construction of roller-skates by often occasioning spots onthe clothes of the skat- I may also mention that the skate may to repairthe same, as the parts of the frame are only connected by means ofscrew-bolts and nuts.

Having thus fully described the nature of my invention, what I desire tosecure by Let ters Patent of the United States is 1. In a roller skate,the combination with the frame consisting of the parts A, said partsbeing provided with the outwardly-bent por tions a, forming spaces forthe rollers, and the portions a lying against each other, screw Thuswhen both ICC) bolts passing through said portions a and provided withnuts whereby the parts A may be readily detached from each other, aseries of bearings provided in the portions a, the inner bearings beingin a lower horizontal plane than the outerones,of the rollers providedwith axles jonrnaled in the said bearings, the inner rollers therebyoccupyin g a position in a lower horizontal plane than the outerrollers, and all of said rollers being arranged in the same verticalplane and longitudinally of the skate, as and for the purpose specified.

2. In a roller skate, the combination with the frame consisting of thetwo parts A said parts being provided with the outwardly-bent portionsa, whereby to form spaces for the rollers, and the portions a lyingagainst each other, the screw-bolts B passing through the port-ions a,the nuts 0 on said bolts B, the

boxes II carried by said parts A on their outer sides and filled withabsorbent material, and the bearings G formed in said parts A, the innerones of which are in a lower horizontal plane than the outer ones, asdescribed, 01": the rollers D having rounded edges and provided withaxles F journaled in the hearings G and extending within the boxes II,the two inner rollers being arranged in close proximity to each otherand somewhat removed from the outer rollers, and in a lower horizontalplane than said outer rollers.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

FRIEDRICH FRANKENBERG.

Witnesses:

W. HAUPT, L. A. EDWARDS.

